Active window looses focus at random

Hi all,

Recently in the past couple weeks or so I've noticed while working on my Mac the front most current window of whichever application I am in will loose focus at random times and act as if I clicked on another window of that app and recede to the background etc... There doesn't seem to be any method to the madness nor have I installed anything new as of late that I can think could be causing this. It happens several times a day and is very frustrating. It's specially annoying while working in any image editing apps causing all sorts of slow down to my workflow.

Can anyone tell me how to go about tracking down the cause? Ive done a bit of research online and there seems to be some terminal commands that should be able to give me an idea but I haven't had any luck here. Probably because all of the threads I saw were outdated by several years and MOST likely because I'm not very familiar working in the terminal etc....

Anyone have suggestions? Much thanks in advance.

-Dom

Machine Specs:

iMac (Retina 5K, 27-inch, 2017)

Mac OS High Sierra (10.13.5)

4.2 GHz Intel Core i7

40 GB 2400 MHz DDR4

1 TB Flash Storage (300 GB Free)

Radeon Pro 580 8192 MB

Wacom Cintiq 27QHDT Display